cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A250438 Number of (n+1)X(3+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 1296
2 14400
3 160000
4 1000000
5 6250000
6 27562500
7 121550625
8 423536400
9 1475789056
10 4337012736
11 12745506816
12 32920473600
13 85030560000
14 198470250000
15 463250390625
16 996503062500
17 2143588810000
18 4311270849600
19 8670998958336

List of values

[1296, 14400, 160000, 1000000, 6250000, 27562500, 121550625, 423536400, 1475789056, 4337012736, 12745506816, 32920473600, 85030560000, 198470250000, 463250390625, 996503062500, 2143588810000, 4311270849600, 8670998958336]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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